四国西部，内子-小田地域の御荷鉾緑色岩類の地質構造

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タイトル別名
  • シコク セイブ ウチコ オダ チイキ ノ ミカブ リョクショク ガンルイ ノ チシツ コウゾウ
  • Geological structures of the Mikabu greenstones of the Uchiko-Oda Area,West Shikoku

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説明

Geological structures of the Mikabu greenstones were studied in the Uchiko-Oda Area in West Shikoku. Greenstones near Mt. Takamori, to the east of Ikazaki, consist of basaltic tuff breccia, tuff and gabbro. They continue eastward, through Umezu, to the widely distributed Mikabu greenstones near Mt. Rohgajo and Mimido. Therefore, the greenstones near Mt. Takamori and Umezu can be correlative with the Mikabu greenstones. The Mikabu greenstones of the Uchiko-Oda Area are intercalated in the Jurassic accretionary complex as a sheet-like unit, and are folded by the Utsumukiyama and Odagawa antiforms. The Mikabu greenstones should be included in the northern Chichibu Terrain in the sight of geological structures. The Kiyomizu Tectonic Line, which runs along the northern margin of the Mikabu greenstones, is probably a large fault, dividing the Sanbagawa Terrain from the Northern Chichibu Terrain.

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